136 HYMENOPTERA OF AMERICA. [PART I. 



a point behind the summit of each eve, two spots or an incomplete 

 border on prothorax, a spot under the wing and two on meta- 

 thorax, pale yellow; first abdominal segment ornamented with a 

 border of the same color, interrupted in the middle and extending 

 along the sides; the 2d and 3d having their border brownish, the 

 2d beyond being ornamented with a pale yellow border, inter- 

 rupted and subraarginal. Coxae 2d and 3d spotted with yellow; 

 anterior tibiae and tarsi varied with ferruginous; the hair of the 

 legs a little golden. Wings brown, with violet reflections. 



Ress. a. diff. — This Monobia differs from M. angulosa by its 

 clypeus, which presents a flat surface, bordered by two little 

 arcuate, convergent ridges, which end in meeting the two denti- 

 form terminal angles of the clypeus, which approach nearer than 

 with the M. angulosa, where the ridges are straight; 2d, by 

 the deeper concavity of the metathorax ; 3d, by the structure of 

 the border of segments 2, 3, of which one sees uo trace in the 

 M. angulosa. 

 Hah. The torrid parts of Mexico. 



8. JI. liigripeimis n. sp. — Valida, nigra, valde cribrata ; clypeo 9 

 apice bidentato, fulvo-marginato ; metaiioto rugoso, bidentato, foveola 

 punctata, sed hand acute marginata instructo, alis nigris. 



Total length, 20 mm. ; wing, 15 mm. 



9. Large. Appearance of a Rhynchium. Clypeus pyriform, 

 convex, cribrose with coarse pits, terminated by two dentiform 

 angles. Head and thorax densely and coarsely cribrose ; back 

 couvex; anterior margin of prothorax crested; post-scutel punc- 

 tured above; its posterior face coinciding with the truncation of 

 the metathorax. This last rugose; its concavity distinct, punc- 

 tured, but not inclosed; its upper edges effaced by the rugosities; 

 on each side is a spiniform tooth. Abdomen conical, very densely 

 punctured, velvety ; the first segment nearly as wide as the second, 

 anteriorly truncate, but not presenting any distinct edge; the 2d 

 moderately long; those following not being more strongly punc- 

 tured. 



Insect entirely black, velvety; its hairs black; the feet only a 

 little grayish; a spot on upper part of mandibles and a line along 

 the latero-inferior borders of clypeus, tawny. Wings black, their 

 terminal border only, a little whitish. 



Ress. a. cliff. — This insect much resembles the Monobia api- 



